Flaw sizing with distance,probe displacement,size (DDS) diagrams |
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| Affiliation: | 1. Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, PR China;2. Department of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, PR China;1. King Saud University, College of Engineering - Petroleum and Natural Gas Engineering Department, Riyadh 11421, Saudi Arabia;2. National Center for Oil and Gas Technology, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia;3. Benha University, Faculty of Science, Geology Department, P.O. Box 13518, Egypt;4. Mining and Petroleum Engineering Department, Faculty of Engineering, Al-Azhar University, Egypt;1. WPI-MANA, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan;3. Graduate School of Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu, Fukuoka 804-8550, Japan;4. Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;5. Department of Materials Physics, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8603, Japan;6. Institute for Technical Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein- Leopoldshafen, Germany |
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| Abstract: | Echo drop is one of the commonly used methods of flaw sizing in ultrasonic NDT. This method, which can measure flaw dimensions due to changes in echo amplitude observed during ultrasonic probe displacement, has some limitations with regard to defect geometry and dimensions. The results described show the relationships of probe displacement, measured with echo drops of 6, 10 and 20 dB, on ultrasonic probe-flaw distance and flaw size. The DDS diagrams provide information about the usefulness of echo-drop methods for sizing totally embedded and side-wall breaking defects with the help of probes generating divergent beams of longitudinal waves. |
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